Telephone line sourced power supply
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United States of America Patent
Stats
-
Sep 3, 1996
Grant Date -
N/A
app pub date -
May 13, 1994
filing date -
May 13, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a telecommunication unit attached to a telephone line, power is provided by taking power from the telephone line when the unit is off-hook. When the unit remains on-hook, power is maintained to circuitry in the unit by a charge stored in a capacitor. When the capacitor's charge is reduced to a level no longer able to sustain operation of the unit, the unit is briefly taken off-hook, allowing the capacitor to recharge. Charge control of the capacitor is performed either by discrete circuitry or by a microcontroller, and further includes logic provisions preventing the unit from remaining off-hook for an unduly long period of time.
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Cited Art Landscape
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